/*
 * Copyright 2017 StreamSets Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * MutationObserver directive. Observe changes to characterData
 * including the element's subtree.
 */
angular.module('commonUI.commonDirectives')
    .directive('mutationCallback', function() {
      return {
        link: function(scope, element, attr) {

          var mo = new MutationObserver(function() {
            scope.$emit(attr.mutationCallback);
          });

          mo.observe(element[0], {
            characterData: true,
            subtree: true
          });

        }
      };
    });
